This happens to me also. It started randomly disabling itself after I upgraded to version 4, and the problem persists even since I downgraded to version 3. The icon turns from green to gray, and I have to click the icon and select "0. Enable". Very annoying.

Well, there's nothing in my scheduler and I didn't even know there was a command in HiP to disable it. I'm trying to pinpoint when it happens and if I did anything particular at the time, but it's hard since I never really notice that the icon has turned grey until I try using the remote.